JEE Main 26 Feb 2021 Shift 2 Solved Paper

Let us calculate ‌

n

p

value (number of neutrons to number of protons) of the isotopes of hydrogen (‌11H,‌12H,‌13H) and proton H+.So, tritium is radioactive because of its higher ‌

n

p

value (2>1.5) which makes its nucleus unstable. Tritium emits low energy β−particles ‌−10 e and thus reduces its ‌

n

p

value to attain stability.
‌‌13H⟶‌23He+‌−10e(β−)
‌

n

p

=2‌‌‌

n

p

=0.5